Stichting Laka

Event Report Forms (ERFs) are filed to the IAEA. Sometimes there are multiple event reports, updating the rating, the event description. Here you only see the latest event report

ERF send date: Tue, 16-07-1996
ERF description: Yonggwang unit 4 was operated at the rated power. At full power operation, maintenance crew had to open 2A breaker to check the function of the inverter 02NN but he opened other breaker, 3/A, which is connected to power supply of main feedwater pump no.2 etc. by confusion. As a result of this wrong action of worker, main feed water pump was tripped by power supply line failure due to 3A breaker open. Reactor power cut-back signal was initiated but actuation relay was de-energized because the power supply of this relay is connected to 3A breaker. At 11:20, May 1996 reactor trip occurred by main feed water pump stop which resulted in S/G low level signal.
There was no release of radioactive materials outside the reactor building and no unplanned exposure to employees.
Justification: As full safety functions were available, the event is rated at level "0" as per User's Manual, Part III, Table III, A1
ERF rating date: 10-07-1996
ERF contact person: JEONG-IL YOO
ERF address: GOVERNMENT COMPLEX II, South Korea
ERF affiliation: NUCLEAR INSPECTION AND ENFORCEMENT DIV, ATOMIC ENERGY OFFICE, MIN. OF SCIENCE & TECHN.

This map shows a selection of reports from nuclear and radiological incidents stored in the IAEA NEWS-database.
Locations are estimates. Contact us if a location is wrong.
The map shows a maximum of 100 incidents. If hundred incidents or more are within the map, the yellow perimeter indicates from where events are excluded. Drag or zoom the map to explore different areas.

Power Reactor Research Reactor Radwaste Facility Enrichment Facility Radiation Source Irradiation/Accelerator Facility Transportation

Fuel Fabrication Fuel Reprocessing Research Facility Mining/Milling Radioisotope Processing/Handling Facility Other